I have had a couple of experiences recently where my car will start to shake once I hit speeds of 55 mph or more. It shimmies the steering wheel pretty badly, as well. At times it will stop but without warning start to shake again. The roads in my town are really bad and not maintained so they're full of deep potholes. As much as I try to avoid them I do end up hitting one, once in a while. I do not really want to drive it again without knowing what might be the problem and have it fixed. Thanks so much!